Gradient wear-resistant coating and method for preparing same

Abstract

Provided are a gradient wear-resistant coating and a method for preparing the same. Co50+0.15% CeO2 powder, Co50+0.25% CeO2+6% Ni / Wc powder and Co50+0.4% CeO2+12% Ni / WC powder are used for preparing the gradient wear-resistant coating with the structure of a bottom layer, a transition layer and a wear-resistant layer on the surface of a workpiece in a coaxial powder supply manner and a laser cladding manner, and the wear resisting performance of the work surface of a part is improved. An ultrasonic vibration device and a contour tracing electromagnetic induction heating device are adopted in the cladding process. Ultrasonic oscillation of a certain degree is applied to the area close to a cladded area of the workpiece, the grain size of a cladding layer can be remarkably refined, residual stress can be remarkably eliminated, and therefore generated cracks are reduced, and a cladding layer structure with good performance is obtained. The contour tracing electromagnetic induction heating device can be utilized for effectively reducing thermal stress brought by the temperature gradient of the cladding layer and relieving the cracking tendency. According to the technological parameters of the ultrasonic vibration device, the work frequency ranges from 10 kHz to 20 kHz, the maximum output power is 1,000 W, and the pneumatic pressure ranges from 0.3 MPa to 0.6 MPa. According to the technological parameters of the contour tracing electromagnetic induction heating device, the voltage is 380 V, the frequency is 60 Hz, and the heating temperature ranges from 150 DEG C to 1,000 DEG C.

Description

technical field [0001] The invention belongs to the field of material processing, and relates to a method for preparing a gradient wear-resistant coating by using ultrasonic vibration and contour tracking electromagnetic induction heating to assist laser cladding, including a method for designing the powder composition and structure of the gradient wear-resistant coating. It is suitable for laser surface cladding treatment. Background technique [0002] Laser cladding technology is an advanced surface strengthening technology. The selected coating material is placed on the surface of the cladding substrate through different feeding methods, and then irradiated by laser to melt the thin layer on the surface of the substrate at the same time, and after rapid solidification Form a surface coating with a very low dilution rate and form a metallurgical bond with the substrate, and the formed coating has better properties such as wear resistance, corrosion resistance, impact resis...

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Problems solved by technology

[0008] Chinese patent CN104451673A discloses a method of synchronous ultrasonic vibration assisted laser technology to prepare ultra-high hardness cladding layer, in which the wear-resistant coating is prepared by presetting powder with ultrasonic vibration, but the laser utilization rate of prepowder method is relatively low, The reflected laser energy and the energy lost by splashing of cladding materials are more

For shaft parts with complex structures, the shape of the surface to be processed is irregular, and the distance between the coil and the heating surface of the part cannot be kept consistent, resulting in uneven heating of the part surface

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